Preparation method of polyester film for improving adhesive force of white PET photographic paper base film photosensitive coating

Abstract

The invention discloses a preparation method of a polyester film for improving the adhesive force of a white PET photographic paper base film photosensitive coating. The preparation method is characterized by comprising the following steps: mixing ethylene glycol with 4, 4'-diphenylmethane diisocyanate to prepare a hydroxyl-terminated polyurethane prepolymer; adding terephthalic acid, ethylene glycol, polyethylene glycol 1000, the hydroxyl-terminated polyurethane prepolymer, antimonous oxide serving as a catalyst and trimethyl phosphate serving as a stabilizer into a reactor, and performing aheating and pressurizing reaction to obtain PET copolymerized polyester resin; and extruding PET copolymer polyester resin and titanium dioxide PET master batch by an extruder, preparing a cast sheetby a cold drum, longitudinally stretching, transversely stretching, entering an electric heating channel heat setting area, cooling at 60-80 DEG C and room temperature, and carrying out corona windingto obtain the product. The polyester film for improving the adhesive force of the white PET photographic paper base film photosensitive coating is good in performance, and is suitable for PET digitalphotographic paper, inkjet films, packaging films and the like.

Description

technical field [0001] The invention belongs to the preparation of organic macromolecular compounds, and relates to a preparation method of a polyester film for improving the adhesion of white PET photographic paper base film photosensitive paint. The polyester film prepared by the invention for improving the adhesion of the photosensitive paint of the base film of the white PET photographic paper is suitable for the fields of PET digital photographic paper, inkjet film, packaging film and the like. Background technique [0002] Polyester film (referred to as PET film) has long been an ideal support for photosensitive films because of its strong physical and chemical stability, especially in medical films, industrial films, printing films, etc. that require high dimensional stability and weather resistance. In the field, the early cellulose acetate film obviously cannot meet the requirements, but the PET film has high molecular chain rigidity and few polar groups, which dete...

AI Technical Summary

Problems solved by technology

[0002] Polyester film (referred to as PET film) has long been an ideal support for photosensitive films because of its strong physical and chemical stability, especially in medical films, industrial films, printing films, etc. that require high dimensional stability and weather resistance. In the field, the early cellulose acetate film obviously cannot meet the requirements, but the PET film has high molecular chain rigidity and few polar groups, which determines its small surface energy, low surface tension, and poor hydrophilicity, so it is difficult to be compatible with The hydrophilic coating, especially the photosensitive emulsion layer containing hydrophilic gelatin, is firmly combined. Although the corona treatment of the PET film can be used to improve its surface properties, although the corona treatment can improve the surface state of the PET film and improve Hydrophilic, but the degree of crosslinking is far from the actual use requirements. Later, people continue to study the surface modification technology of PET film

In the prior art, the production methods of film modification mainly contain the following two types: (1) surface coating: CN1539652A adopts chlorinated olefin acrylic acid copolymer emulsion, resorcinol and gelatin water-based coating liquid to coat on the PET film, Although the PET film and the photosensitive layer containing gelatin can be firmly bonded to meet the requirements of use; but resorcinol is volatile when dry, corrodes equipment and pollutes the environment, and causes harm to the health of production workers. Ethylene dichloride contains higher chlorine, and a large amount of toxic and harmful chlorine-containing gases will be produced when incinerated in the recycling link; (2) in-situ polymerization: CN106750206A and CN107987263A adopt polyhydric alcohols such as glycerol, pentaerythritol, Dipentaerythritol modification increases the polarity of PET polyester, but in the synthesis of PET, polyols react with acids to easily produce crosslinking, resulting in gel points, which affect fiber spinnability and film appearance

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